This paper examines the accuracy of the speech transmission index (STI) calculated from the reverberation time (T) and signal-to-noise ratio (LSN) of enclosed spaces. Differences between measured and predicted STIs have been analysed in two rooms (reverberant vs. absorbent), for a wide range of absorption conditions and signal-to-noise ratios (sixteen tests). The STI was measured using maximum length sequence analysis and predictions were calculated using either measured or predicted values of T and LSN, the latter assuming diffuse sound field conditions. The results obtained for all the conditions tested showed that STI predictions based on T and LSN tend to underestimate the STI, with differences between measured and predicted STIs always lower than 0.1 (on a 0.0 - 1.0 scale), and on average lower than 0.06. According to previous research, these differences are noticeable and therefore non-negligible, as 0.03 is the just noticeable difference in STI. The use of either measured or predicted values of T and LSN provided similar STI predictions (i.e. non-noticeable changes), with differences between predictions that are on average lower than 0.03 for the absorbent room, and lower than 0.01 for the reverberant room.
FingerprintDive into the research topics of 'Accuracy of speech transmission index predictions based on the reverberation time and signal-to-noise ratio'. Together they form a unique fingerprint.
- School of Energy, Geoscience, Infrastructure and Society, Institute for Sustainable Building Design - Assistant Professor
- School of Energy, Geoscience, Infrastructure and Society - Assistant Professor
Person: Academic (Research & Teaching)